Checking for previous backup or datapump.

We are looking for implement monitoring over database backup progress.

to ensure that every database are backup within a certain limit, possible to generate a report on every week to show that backup is run, and their scope.

basically, it would be running RMAN list backup

but problems arise as some of the database didn't use RMAN for backup, instead, they use expdp instead.

is there anyway to monitor ?

Thanks.